JP2007038340A - Chuck device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chuck device, preventing the occurrence of galling between a dummy pin and a chuck in the chucking operation when a chuck jaw performs holding operation to repeatedly surely perform the chucking operation smoothly. <P>SOLUTION: In this chuck device, the chuck jaw 2 is supported on the chuck body 1 to move in the axial direction, and the diameter is reduced and enlarged, interlocking with the axial movement of the chuck jaw 2 to hold and release a work W at the tip of the chuck jaw 2. When the chuck jaw 2 holds the work W, the dummy pin 4 capable of holding it at the root of the chuck jaw 2 is supported on the chuck body 1 to move in the vertical direction. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a chuck device for gripping a workpiece when conveying or processing a shaft-shaped workpiece.

2. Description of the Related Art Conventionally, a chuck device that grips a shaft-shaped workpiece with a chuck claw is known. As such a chuck device, an air provided with a cylindrical chuck body, a chuck claw that reduces and expands the diameter to grip a workpiece, and a cylinder rod that pushes the chuck claw in one of the chuck body axial directions. A cylinder mechanism and a compression spring that pushes back the chuck claw in the axial direction, and further, a location where the tip inner peripheral portion of the chuck body and the tip outer periphery of the chuck claw contact with a cylindrical structure, In addition, a taper is provided at a position where the chuck pawl and the cylinder rod come into contact, and the chuck pawl opens and closes (expands and contracts) as the chuck pawl moves up and down while sliding on the inner periphery of the chuck body. An apparatus that operates is known (see, for example, Patent Document 1).
Japanese Utility Model Publication No. 7-24581

  However, in the conventional chuck device as described above, when the gripping allowance of the workpiece by the chuck pawl is small, the chuck pawl is tilted by one piece and cannot be gripped firmly because the chuck pawl is held only by the tip of the chuck pawl. There is.

  Therefore, a dummy pin is arranged on the opposite side of the chuck claw where the workpiece is grasped, and when the chuck claw is reduced in diameter, the workpiece is grasped at the tip and the dummy pin is grasped at the proximal end on the opposite side, A measure to prevent the chuck pawl from being tilted against one side can be considered.

However, even if such measures are taken, the following problems to be solved remain.
(Problem 1)
When the chuck claw is raised and lowered, the chuck claw slides with the dummy pin. For this reason, when it is used repeatedly, the sliding resistance between the dummy pin and the chuck claw causes galling, resulting in a problem that the chuck claw does not operate smoothly.

(Problem 2)
When gripping the workpiece, the chuck pawl slides with the workpiece because it decreases in diameter while descending. For this reason, when the workpiece is gripped, a force that presses the workpiece downward from the chuck claw acts, and impacts the workpiece and the receiving jig. Furthermore, if the chucking operation is repeatedly performed, the gripping may occur between the chuck jaws and the workpiece during gripping, and gripping may fail.

(Problem 3)
When releasing the workpiece, the chuck pawl slides with the workpiece because the diameter of the chuck claw increases as it rises. Therefore, when the workpiece is released, the workpiece may be lifted upward due to frictional resistance caused by sliding. In this case, since the workpiece is lifted once and then released and dropped, it is impossible to handle the workpiece and the receiving jig in an impact and to handle the workpiece precisely.

  Accordingly, the present invention has been made in view of the above-described conventional problems, and the invention according to any one of claims 1 to 3 can generate galling between a dummy pin and a chuck claw during a chuck operation in which the chuck claw performs a gripping operation. It is an object of the present invention to provide a chuck device capable of preventing the occurrence of the problem and performing the chucking operation repeatedly and smoothly. Another object of the present invention is to provide a chuck device that can prevent the workpiece from being pushed downward during the chucking operation, and can achieve a smooth and reliable chucking operation repeatedly. Furthermore, an object of the present invention is to provide a chuck device that prevents the workpiece from being lifted when the workpiece is released and prevents an excessive shock from being applied to the workpiece and the receiving jig. The inventions according to claims 6 and 7 can prevent the dummy pin and the chuck from being squeezed during the chucking operation, enabling the chucking operation to be repeatedly and smoothly performed, and lifting the workpiece when the workpiece is released. It is an object of the present invention to provide a chuck device capable of preventing the above-described problem and preventing an excessive impact from being applied to the workpiece and the receiving jig. According to the eighth aspect of the present invention, it is possible to prevent the dummy pin and the chuck from being squeezed at the time of chucking operation, to make it possible to repeatedly and surely perform the chucking operation, and to lower the workpiece at the time of chucking operation. To prevent the workpiece from being lifted and prevent the workpiece from being lifted when the workpiece is released, so that no excessive impact is applied to the workpiece and the receiving jig. An object of the present invention is to provide a chuck device that can achieve the above.

  Accordingly, in order to achieve the above-described object, the invention according to claim 1 is such that the chuck claw is supported by the chuck body so as to be movable in the axial direction, and the diameter reduction and diameter expansion are performed in conjunction with the axial movement of the chuck claw. The chuck device grips and releases the workpiece at the tip of the chuck claw, and when the chuck claw grips the workpiece, the dummy pin that can be gripped at the base of the chuck claw moves up and down to the chuck body. The chuck device is characterized by being supported.

  According to the second aspect of the present invention, the chuck claw is supported by the chuck body so as to be movable in the axial direction, and the diameter is reduced and expanded in conjunction with the axial movement of the chuck claw. A chuck device for gripping and releasing a workpiece, wherein when the chuck claw grips a workpiece, a dummy pin that can be gripped at the base of the chuck claw is fixed to the chuck body, and the chuck claw and the dummy pin The chuck device is characterized in that a bearing member for reducing sliding resistance during gripping is provided on any one of the sliding portions.

  According to a third aspect of the present invention, in the chuck device according to the second aspect, the bearing member is a ball plunger that is rotatably supported.

  According to a fourth aspect of the present invention, the chuck claw is supported by the chuck body so as to be movable in the axial direction, and the diameter is reduced and expanded in conjunction with the axial movement of the chuck claw. A chuck device for gripping and releasing a workpiece, wherein when the chuck claw grips a workpiece, a dummy pin that can be gripped at the base of the chuck claw is provided, and in the chuck claw, on the contact surface with the workpiece, The chuck device is provided with a one-way clutch that rolls in the relative movement direction when gripping the workpiece and restricts rolling by the relative movement in the opposite direction.

  In the invention according to claim 5, the chuck claw is supported by the chuck body so as to be movable in the axial direction, and the diameter of the chuck claw is reduced and expanded in conjunction with the axial movement of the chuck claw. A chuck device for gripping and releasing a workpiece, wherein when the chuck claw grips a workpiece, a dummy pin that can be gripped at the base of the chuck claw is fixed to the chuck body, and a tip of the dummy pin is fixed to the workpiece. A chuck that is disposed at a height that is in contact with or substantially in contact with the height of the workpiece tip during gripping, and has a function of suppressing the workpiece from being lifted by friction with the chuck claw when the workpiece is released. The device.

  The invention according to claim 6 is the chuck device according to claim 2, wherein the tip of the dummy pin is disposed at a height that is in contact with or substantially in contact with the height of the tip of the workpiece when gripping the workpiece, It has a function of suppressing lifting of the workpiece due to friction with the chuck claws when the workpiece is released.

  According to a seventh aspect of the present invention, in the chuck device according to the first aspect, the dummy pin is formed in a hollow shape, and a block pin disposed in a hollow portion of the dummy pin is fixed to the chuck main body. The pin is at a height that touches or almost touches the height of the workpiece tip when the workpiece is gripped by the chuck claw, and the function that prevents the workpiece from lifting due to friction with the chuck claw when the workpiece is released It is characterized by having.

  The invention according to claim 8 is the chuck device according to claim 6 or 7, wherein the chuck claw rolls on the contact surface with the workpiece in the direction of relative movement during gripping the workpiece, and vice versa. A one-way clutch that restricts rolling by relative movement in the direction is provided.

  In the chuck device according to the first aspect, since the dummy pin is supported by the chuck body so as to be movable in the axial direction, when the chuck claw is reduced in diameter while moving in the axial direction, the dummy pin is located between the chuck claw and the chuck pin. When friction is applied, it moves with the chuck claw. Therefore, the occurrence of galling between the chuck claw and the dummy pin can be prevented, and a reliable and smooth chuck operation can be performed repeatedly.

  In the chuck device according to claim 2 and claim 3, since the bearing member is provided at the sliding portion between the chuck claw and the dummy pin, when the diameter of the chuck claw is reduced while moving in the axial direction, Contact resistance with chuck claws is reduced. Therefore, the occurrence of galling between the chuck claw and the dummy pin can be prevented, and a reliable and smooth chuck operation can be performed repeatedly. In particular, in the chuck device according to the third aspect, the ball plunger as the bearing member is brought into rolling contact, and high anti-galling performance is obtained.

  In the chuck device according to claim 4, when the chuck claw is reduced in diameter while moving in the axial direction and grips the workpiece, the contact between the workpiece and the chuck claw becomes a rolling contact via the one-way clutch, and the galling is prevented. Thus, it is possible to perform a smooth and reliable chucking operation repeatedly, and to prevent the pressing by the friction and to prevent the workpiece and the receiving jig from being shocked. Further, since the one-way clutch does not roll in the opposite direction, the gripped work does not fall off due to rolling.

  In the chuck device according to claim 5, when the chuck claw moves while expanding the diameter in the axial direction to release the workpiece, the dummy pin suppresses the workpiece from being lifted even if a force acts upward on the workpiece. It is possible to handle the workpiece without applying extra impact to the workpiece and the receiving jig.

  The chuck device according to the sixth aspect can obtain the galling prevention effect by the bearing member according to the second aspect and the work rise prevention effect when the work is released according to the fifth aspect.

  According to the seventh aspect of the present invention, when the workpiece is gripped, the dummy pin moves together with the chuck claw as in the first aspect of the invention, and prevents the chuck claw and the dummy pin from being frayed. be able to. On the other hand, when the workpiece is released, even if an upward force is applied to the workpiece, the block pin suppresses the workpiece from being lifted, and the workpiece can be handled without adding extra impact to the workpiece and the receiving jig.

  The chuck device according to an eighth aspect of the present invention is the chuck device according to the sixth or seventh aspect, further capable of preventing galling between the chuck pawl and the workpiece by the one-way clutch and pressing by friction.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
The chuck apparatus of Embodiment 1 is demonstrated based on FIGS.

  As shown in FIG. 1, the chuck device according to the first embodiment includes a chuck body 1, a chuck claw 2, a sliding mechanism 3, and a dummy pin 4.

  The chuck body 1 is formed in a cylindrical shape (see FIG. 4), and supports the chuck claw 2, the dummy pin 4, and the cylinder rod 5 so as to be slidable in the axial direction (vertical direction in the figure). An air chamber 12 as a cylinder tube of the air cylinder mechanism 31 constituting the sliding mechanism 3 is formed in the middle portion, and a support plate 13 for slidably supporting the dummy pin 4 is provided at the upper end. It has been.

  The chuck claw 2 is composed of three claw bodies 2a, 2a, 2a (see FIG. 4), and a lower tip is provided on the outer periphery of the lower end and the upper periphery of the flange 23 provided on the outer periphery of the intermediate part. A first tapered surface 21 having a shape narrowed toward the upper side and a second tapered surface 22 having a shape narrowed toward the upper base are formed. Further, an opening tapered surface 11 a that is in contact with the first taper surface 21 and narrows downward is formed on the inner periphery of the opening 11, and the chuck claw 2 is moved when the chuck claw 2 moves downward relative to the chuck body 1. Is configured to be reduced in diameter.

  The sliding mechanism 3 is a mechanism that slides the chuck claw 2 and the cylinder rod 5 up and down, and includes an air cylinder mechanism 31 and a return spring 32.

  The air cylinder mechanism 31 has an air chamber 12 formed in the chuck body 1 and a piston portion 51 arranged in the air chamber 12 and dividing the air chamber 12 into an upper chamber 12a and a lower chamber 12b on the outer periphery. The cylinder rod 5 is provided with an upper supply / discharge hole 33 communicating with the upper chamber 12a through the chuck body 1 and a lower supply / discharge hole 34 communicating with the lower chamber 12b. The lower end portion of the cylinder rod 5 is attached to the outer periphery of the second taper surface 22 of the chuck claw 2, and a cylinder taper surface 52 is formed so as to expand downward on the inner periphery in contact with the second taper surface 22. ing.

  The return spring 32 is installed between the lower surface of the flange 23 of the chuck claw 2 and the lower end portion of the chuck body 1 and urges the chuck claw 2 upward.

  The dummy pin 4 is a cylinder formed of a metal having an outer diameter substantially the same as the workpiece W, and is disposed on the central axis of the chuck body 1 and supported by the support plate 13 so as to be slidable in the vertical direction. ing. Further, a flange 41 is provided at the upper end of the dummy pin 4, and a return spring 42 that biases the dummy pin 4 upward is mounted on the outer periphery of the dummy pin 4 between the flange 41 and the support plate 13. Further, an end plate 14 that restricts the upward movement of the dummy pin 4 at a predetermined position is provided above the dummy pin 4. The dummy pin 4 is set to a length where the lower end of the dummy pin 4 overlaps the upper portion of the chuck claw 2 in the horizontal direction at a position where the upward movement is restricted by the end plate 14.

  Next, the operation of the chuck device according to the first embodiment will be described.

  When gripping the workpiece W from the state in which the chuck claw 2 shown in FIG. 1 is expanded, the compressed air is supplied from the upper supply / discharge hole 33 to the upper chamber 12a in the air cylinder mechanism 31 of the sliding mechanism 3 as shown in FIG. The lower supply / discharge hole 34, that is, the lower chamber 12b is released to the atmosphere. As a result, the cylinder rod 5 is slid downward and the chuck claw 2 is pushed down against the biasing force of the return spring 32. As the cylinder rod 5 and chuck claw 2 move downward, the first taper surface 21 is moved downward along the opening taper surface 11a, and the cylinder taper surface 52 is moved downward along the second taper surface 22. As a result, the diameter of the chuck claw 2 is reduced.

  Due to the reduced diameter of the chuck claw 2, the workpiece W is gripped at the tip of the chuck claw 2, while the dummy pin 4 is gripped at the root of the chuck claw 2. As described above, the chuck claw 2 grips the dummy pin 4 having the same diameter as that of the workpiece W at the opposite base portion at the same time when the workpiece 2 is gripped only by the tip portion thereof. It is possible to prevent the W from being in a single-contact state and to be tilted, and the gripping force can be increased by keeping the contact surface of the workpiece W and the chuck claw 2 in parallel.

  Further, the chuck claw 2 is reduced in diameter while moving downward as described above, and grips the dummy pin 4 at the base of the chuck claw 2. At this time, the chuck claw 2 faces downward due to friction with the chuck claw 2. When the force is applied, the dummy pin 4 is lowered against the urging force of the return spring 42.

  As described above, since the dummy pin 4 moves in conjunction with the vertical movement of the chuck claw 2, the sliding of the dummy pin 4 and the chuck claw 2 is suppressed, and galling is prevented from occurring between them. Can perform a proper chucking operation.

  Next, when releasing the workpiece W, as shown in FIG. 1, the air cylinder mechanism 31 supplies compressed air from the lower supply / discharge hole 34 to the lower chamber 12b, while the upper supply / discharge hole 33, that is, the upper chamber 12a. To the atmosphere. Accordingly, the cylinder rod 5 is slid upward, and the chuck claw 2 is moved upward by the urging force of the return spring 32. As the chuck claw 2 moves upward, the diameter of the chuck claw 2 is increased and the workpiece W and the dummy pin 4 are released. A means for urging the chuck claw 2 in the expanding direction as the chuck claw 2 moves upward may be provided. As this urging means, a leaf spring, a means for sucking the outer peripheral portion of the chuck claw 2, or the like can be used.

  When the chuck claw 2 releases the dummy pin 4, the dummy pin 4 returns to the initial position where it comes into contact with the end plate 14 by the urging force of the return spring 42.

  As described above, in the chuck device according to the first embodiment, the dummy pin 4 is supported by the chuck body 1 so as to be slidable in the vertical direction. The chuck claw 2 can be opened and closed smoothly without causing galling between the chuck claw 2 and the dummy pin 4.

(Other embodiments)
Other embodiments will be described below with reference to the drawings. In this description, the same or equivalent components in each embodiment will be denoted by the same reference numerals, and description thereof will be omitted.

(Embodiment 2)
Next, the chuck device of the second embodiment will be described with reference to FIGS.

  In the chuck device according to the second embodiment, the upper end portion of the dummy pin 240 is fixed to the support plate 13 of the chuck body 1. In the second embodiment, this fixing is performed by fastening a nut 241 to a screw formed on the outer periphery of the dummy pin 240 and holding the support plate 13 between the flange 41 and the nut 241.

  A ball plunger 242 as a bearing member is provided on the outer periphery of a sliding portion (a portion overlapping in the horizontal direction) with the chuck claw 2 at the lower end portion of the dummy pin 240 so as to roll. The dummy pin 240 is formed so that the outer diameter including the ball plunger 242 is substantially equal to the outer diameter of the workpiece W. The dummy pin 240 has a smaller diameter than the dummy pin 4 of the first embodiment. Is used.

  Other configurations are the same as those in the first embodiment.

  Next, the operation of the chuck device according to the second embodiment will be described.

  When gripping the workpiece W, the cylinder rod 5 is moved downward by the air cylinder mechanism 31 of the sliding mechanism 3 and the chuck pawl 2 is reduced in diameter as in the chuck device of the first embodiment. At the same time as the workpiece W is gripped by the tip of the chuck claw 2, the lower end of the dummy pin 240 is gripped by the root of the chuck claw 2.

  Further, when releasing the workpiece W, the cylinder rod 5 is moved upward by the air cylinder mechanism 31 and the chuck pawl 2 is moved upward while the diameter is increased, as in the chuck device of the first embodiment. The workpiece W and the dummy pin 240 are released.

  As described above, when the chuck claw 2 grips and releases the dummy pin 240, the chuck claw 2 contracts and expands while sliding in the vertical direction with respect to the dummy pin 240. In the second embodiment, The chuck claw 2 moves while being in rolling contact with a ball plunger 242 provided at the lower end of the dummy pin 240. For this reason, the sliding resistance acting between the chuck claw 2 and the dummy pin 240 can be kept low, and galling can be prevented at the time of sliding, whereby repeated and smooth handling can be performed repeatedly. .

(Embodiment 3)
Next, a chuck device according to Embodiment 3 will be described with reference to FIGS.

  The chuck device according to the third embodiment is a modification of the second embodiment, and will be described with a focus on differences from the second embodiment.

  In the third embodiment, as shown in FIG. 7, a one-way clutch 321 is provided in a portion that grips the workpiece W inside the tip end portion of the chuck claw 320. This one-way clutch 321 has a one-way clutch structure that rolls when the chuck claw 320 moves relative to the workpiece W2 relative to the workpiece W2 (when the diameter is reduced) and stops when the chuck claw 320 moves in the opposite direction. . That is, as shown in FIG. 9, the one-way clutch 321 is configured such that the outer peripheral surface appearing inside the chuck pawl 2 rolls upward and stops downward.

  The dummy pins 340 are fixed to the support plate 13 by nuts 241 as in the second embodiment. The outer diameter of the dummy pin 340 is formed by adding an outer diameter of the workpiece W2 to a dimension in which the one-way clutch 321 protrudes from the chuck claw 320.

  Other configurations are the same as those in the first embodiment.

  Next, the operation of the chuck device according to the third embodiment will be described.

  Similar to the chuck device of the first embodiment, when gripping the workpiece W2, the cylinder rod 5 is moved downward, and the chuck claw 320 is moved while being reduced in diameter, and the tip of the chuck claw 320 is moved. At the same time as the workpiece W2 is gripped, the lower end portion of the dummy pin 340 is gripped at the base of the chuck claw 320.

  Also, when releasing the workpiece W2, the cylinder rod 5 is moved upward, and the chuck pawl 320 is moved upward while the diameter is increased, as in the chuck device of the first embodiment. 340 is released.

  As described above, in the third embodiment, when the chuck claw 320 reduces the diameter while moving downward, the chuck claw 320 is provided at the lower end portion of the chuck claw 320 when gripping and releasing the workpiece W2. The one-way clutch 321 moves while being in rolling contact with the workpiece W2.

  For this reason, the sliding resistance acting between the chuck claw 320 and the workpiece W2 can be kept low, galling can be prevented at the time of sliding, and the workpiece W is received by the friction below the drawing. There is no problem of pressing against the tool.

  In addition, since the one-way clutch 321 is stopped from rotating downward, the gripped work W2 does not fall.

(Embodiment 4)
Next, the chuck device according to the fourth embodiment will be described with reference to FIGS.

  In the chuck device according to the fourth embodiment, dummy pins 440 are fixed to the support plate 13 as in the second embodiment. Further, the lower end of the dummy pin 440 is disposed at a height that is in contact with or close to the tip of the workpiece W when the chuck claw 2 grips the workpiece W. The lower end includes rubber, soft resin, metal spring, A buffer material 442 made of a fluid spring or the like for absorbing an impact in the vertical direction is provided.

  Other configurations are the same as those in the first embodiment.

  Next, the operation of the chuck device according to the fourth embodiment will be described.

  Similar to the chuck device of the first embodiment, when gripping the workpiece W, the cylinder rod 5 is moved downward, and the chuck claw 2 is moved while being reduced in diameter. And the dummy pin 440 is gripped.

  When releasing the workpiece W, the cylinder rod 5 is moved upward and the chuck pawl 2 is moved upward while expanding the diameter, as in the chuck device of the first embodiment. 440 is released.

  Further, when the chuck claw 2 releases the workpiece W, the chuck claw 2 expands while rising, and therefore slides with the workpiece W. Therefore, a force acts in a direction in which the workpiece W is lifted by friction, but the workpiece W hits the lower end of the dummy pin 440 disposed at a position in contact with or close to the upper side thereof and is released without being lifted. .

  Therefore, it is possible to prevent the workpiece W from being lifted when the workpiece is released, and the workpiece W can be handled without applying an extra impact to the workpiece W and the receiving jig. In addition, since the buffer material 442 is provided at the lower end of the dummy pin 440, even if the work W hits the dummy pin 440, the work W is not shocked or scratched.

(Embodiment 5)
Next, a chuck device according to Embodiment 5 will be described with reference to FIGS.

  In the chuck device according to the fifth embodiment, the dummy pin 540 is supported by the support plate 13 so as to be slidable in the vertical direction, and is urged upward by the return spring 42 as in the first embodiment.

  In the fifth embodiment, the dummy pin 540 is formed hollow, and the block pin 500 is provided coaxially with the dummy pin 540 in the hollow portion.

  The block pin 500 has an upper end fixed to the end plate 14 and a lower end disposed at a height that comes into contact with or close to the tip of the workpiece W when the chuck claw 2 grips the workpiece W. In addition, a cushioning member 501 made of rubber, soft resin, metal spring, fluid spring, or the like is provided at the lower end to absorb the impact in the vertical direction.

  Next, the operation of the chuck device according to the fifth embodiment will be described.

  Similar to the chuck device of the first embodiment, when gripping the workpiece W, the cylinder rod 5 is moved downward, and the chuck claw 2 is moved while being reduced in diameter. And the dummy pin 540 is gripped.

  At this time, since the dummy pin 540 moves downward as in the first embodiment, it is possible to prevent galling, thereby enabling reliable and smooth handling repeatedly.

  When releasing the workpiece W, the cylinder rod 5 is moved upward and the chuck pawl 2 is moved upward while expanding the diameter, as in the chuck device of the first embodiment. 540 is released.

  When the chuck claw 2 releases the workpiece W, the chuck claw 2 is increased in diameter while being lifted, so that it slides on the workpiece W. Therefore, force acts in the direction in which the workpiece W is lifted by friction, but the workpiece W hits the lower end of the block pin 500 disposed at a position in contact with or close to the upper side thereof, and the workpiece W is released without being lifted. The

  Therefore, the workpiece W can be prevented from being lifted when the workpiece is released, and the workpiece W can be handled so as not to apply extra impact to the workpiece W and the receiving jig. In addition, since the buffer material 501 is provided at the lower end of the block pin 500, even if the work W hits the block pin 500, the work W is not shocked or scratched.

(Embodiment 6)
Next, a chuck device according to Embodiment 6 will be described with reference to FIGS.

  The chuck device of the sixth embodiment is a modification of the fifth embodiment, and the difference from the fifth embodiment is that the chuck claw 320 shown in the third embodiment is used instead of the chuck claw 2. It is.

  Therefore, in the chuck device of the sixth embodiment, as in the chuck device of the first embodiment, when gripping the workpiece W, the cylinder rod 5 is moved downward and the chuck claw 2 is The workpiece W and the dummy pin 540 are gripped by the chuck claws 2 while being reduced in diameter downward. At this time, since the dummy pin 540 moves downward as in the first embodiment, it is possible to prevent galling, thereby enabling reliable and smooth handling repeatedly.

  Further, in the chuck device of the sixth embodiment, similarly to the third embodiment, the sliding resistance acting between the chuck claw 320 and the workpiece W2 is suppressed to a low level by the one-way clutch 321, so Can be prevented, and the problem of pressing the workpiece W2 downward by friction does not occur. In addition, since the one-way clutch 321 is stopped from rotating downward, the gripped workpiece W does not fall.

  In addition, as in the fifth embodiment, the work pin W2 can be prevented from being lifted by the block pin 500 when the work is released, and the work W2 can be handled so as not to apply extra impact to the work W2 and the receiving jig. . Moreover, since the buffer material 501 is provided at the lower end of the block pin 500, even if the work W2 hits the block pin 500, the work W2 is not shocked or scratched.

(Embodiment 7)
Next, a chuck device according to Embodiment 7 will be described with reference to FIGS.

  The chuck device of the seventh embodiment is a modification of the second embodiment, and the difference from the second embodiment is that the chuck claw 320 shown in the third embodiment is used instead of the chuck claw 2. It is.

  Therefore, in the chuck device according to the seventh embodiment, as in the second embodiment, when the chuck claw 320 grips and releases the dummy pin 240, the chuck claw 320 is provided at the lower end portion of the dummy pin 240. The ball plunger 242 is moved while being in rolling contact. For this reason, the sliding resistance acting between the chuck claw 320 and the dummy pin 240 can be kept low, galling can be prevented during sliding, and reliable and smooth handling can be performed repeatedly.

  Further, in the chuck device according to the seventh embodiment, as in the third embodiment, the sliding resistance acting between the chuck claw 320 and the workpiece W2 is suppressed to be low, and scouring is provided when sliding. This can be prevented, and there is no problem of pressing the workpiece W2 downward by friction. In addition, since the one-way clutch 321 is stopped from rotating downward, the gripped workpiece W does not fall.

The embodiment of the present invention has been described in detail above with reference to the drawings. However, the specific configuration is not limited to this embodiment, and design changes that do not depart from the gist of the present invention are not limited to this embodiment. Included in the invention.
For example, in the embodiment, the ball plunger 242 is shown as the bearing member, but the bearing member is not limited to this as long as the sliding resistance can be reduced. Not limited to this, it may be provided on the chuck claw. For example, when it is provided on the chuck claw, the roller-shaped member shown in the third embodiment can be used as the bearing member. Moreover, it is not limited to what rolls with respect to a sliding other party, You may use the bearing member which makes contact with a sliding other party a point contact or a line contact, Teflon (trademark) with a low sliding resistance as a raw material, etc. May be used.

  Further, in the embodiment, a three-claw type chuck claw is used. However, the chuck claw is not limited to this, and may have two or four or more claw.

  Further, the means for sliding the chuck claws is not limited to the means shown in the embodiment, and means using other actuators such as a motor may be used.

FIG. 3 is a cross-sectional view showing a workpiece released state of the chuck device according to the first embodiment. 3 is a cross-sectional view showing a workpiece gripping state of the chuck device according to Embodiment 1. FIG. 2 is a side view of the chuck device according to Embodiment 1. FIG. 2 is a bottom view of the chuck device according to Embodiment 1. FIG. 6 is a cross-sectional view showing a workpiece released state of a chuck device according to Embodiment 2. FIG. 6 is a cross-sectional view showing a workpiece gripping state of a chuck device according to Embodiment 2. FIG. FIG. 6 is a cross-sectional view showing a workpiece released state of a chuck device according to a third embodiment. 10 is a cross-sectional view showing a workpiece gripping state of a chuck device according to Embodiment 3. FIG. 6 is a side view of a chuck claw of a chuck device according to Embodiment 3. FIG. FIG. 6 is a cross-sectional view showing a workpiece released state of a chuck device according to a fourth embodiment. FIG. 6 is a cross-sectional view showing a workpiece gripping state of a chuck device according to a fourth embodiment. FIG. 10 is a cross-sectional view showing a workpiece released state of a chuck device according to a fifth embodiment. FIG. 9 is a cross-sectional view showing a workpiece gripping state of a chuck device according to a fifth embodiment. FIG. 10 is a cross-sectional view showing a workpiece released state of a chuck device according to a sixth embodiment. FIG. 10 is a cross-sectional view showing a workpiece gripping state of a chuck device according to a sixth embodiment. FIG. 10 is a cross-sectional view showing a workpiece released state of a chuck device according to a seventh embodiment. FIG. 10 is a cross-sectional view showing a workpiece gripping state of a chuck device according to a seventh embodiment.

Explanation of symbols

1 Chuck body 2 Chuck claw 4 Dummy pin 240 Dummy pin 242 Ball plunger 320 Chuck claw 321 One-way clutch 340 Dummy pin 440 Dummy pin 500 Block pin 540 Dummy pin W Work W2 Work

Claims (8)

A chuck device in which a chuck claw is supported on the chuck body so as to be movable in the axial direction, and the workpiece is gripped and released at the tip of the chuck claw by reducing and expanding the diameter in conjunction with the axial movement of the chuck claw. ,
A chuck device characterized in that, when the chuck claw grips a workpiece, a dummy pin that can be gripped at the base of the chuck claw is supported by the chuck body so as to be movable up and down. A chuck device in which a chuck claw is supported on the chuck body so as to be movable in the axial direction, and the workpiece is gripped and released at the tip of the chuck claw by reducing and expanding the diameter in conjunction with the axial movement of the chuck claw. ,
When the chuck claw grips the workpiece, a dummy pin that can be gripped at the base of the chuck claw is fixed to the chuck body,
A chuck device, wherein a bearing member for reducing sliding resistance during gripping is provided on one of sliding portions of the chuck pawl and the dummy pin.   The chuck device according to claim 2, wherein the bearing member is a ball plunger that is rotatably supported. A chuck device in which a chuck claw is supported on the chuck body so as to be movable in the axial direction, and the workpiece is gripped and released at the tip of the chuck claw by reducing and expanding the diameter in conjunction with the axial movement of the chuck claw. ,
When the chuck claw grips a workpiece, a dummy pin that can be gripped at the base of the chuck claw is provided,
The chuck device, wherein the chuck claw is provided with a one-way clutch that rolls on a contact surface with the workpiece in a relative movement direction at the time of gripping the workpiece and restricts rolling by a relative movement in the opposite direction. A chuck device in which a chuck claw is supported on the chuck body so as to be movable in the axial direction, and the workpiece is gripped and released at the tip of the chuck claw by reducing and expanding the diameter in conjunction with the axial movement of the chuck claw. ,
When the chuck claw grips the workpiece, a dummy pin that can be gripped at the base of the chuck claw is fixed to the chuck body,
The dummy pin tip is disposed at a height that is in contact with or substantially in contact with the height of the workpiece tip when gripping the workpiece, and the function of preventing the workpiece from being lifted by friction with the chuck pawl when the workpiece is released. A chuck device comprising:   A function of suppressing the lifting of the workpiece due to friction with the chuck claw when the workpiece is released when the tip of the dummy pin is disposed at a height that is in contact with or almost in contact with the height of the workpiece tip when gripping the workpiece. The chuck device according to claim 2, comprising: The dummy pin is formed hollow,
A block pin arranged in a hollow portion of the dummy pin is fixed to the chuck body,
This block pin is at a height that touches or almost touches the tip of the workpiece when the workpiece is gripped by the chuck claw, and prevents the workpiece from being lifted by friction with the chuck claw when the workpiece is released. The chuck device according to claim 1, wherein the chuck device has a function to perform.   The chuck claw is provided with a one-way clutch for rolling in a relative movement direction at the time of gripping the workpiece and regulating rolling by a relative movement in the opposite direction on the contact surface with the workpiece. The chuck device according to claim 7.

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